Rainbow Cupcakes

For the volcano effect..
I don't really know because I didn't do it intentionally. However my best guess is that I didn't spread out the different colors while layering - I just dropped them right in the middle of the cupcake form, so I guess that's how they got the 'sunken in' effect.
As for the little tip in the mittle, that's my oven's fault. None of my baked goods ever puff up properly.

How exactly did you get that volcano effect?

wow that's cool and it also looks like a volcano on the inside